Grinding-mill.



N9. 637,958. Patented Nov. 29, I899.

w. F. DAVIS.

GRINDING MILL.

(Application filed July 10, 1899.) (No Model.) 2 Sha9ts--Sheat I.

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Nu: 637,958. Patented Nov. 28, I899.

W. F. DAVIS.

GRINDING MILL.

(Application filed July 10, 1899.) (No Model.) 2 Sheets-Shan 2.

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NITED STATE PATENT FFICE.

WVILLIAM F. DAVIS, OF W VATERLOO, IOWA.

GRINDING-MILL.

SPECIFICATION forming part of Letters Patent No. 637,958, dated November 28, 1899.

Application filed July 10, 1899. Serial No. 723,265- (No model.)

To all whom it may concern.-

Be it known that I, WILLIAM F. DAVIS, a resident of Waterloo, in the county of Black Hawk, State of Iowa, have invented certain new and useful Improvements in Grinding- Mills, of which the following is a full, clear,

and exact description.

The present invention has for its object to provide a simple, cheap, eifective,and durable construction of grinding mill, the invention relating more especially to that class of mills commonly known as feed-mills. In this class of mills it has been heretofore proposed to provide multiplying-gear whereby the movable grinding ring or bur can be driven at a rate of speed greater than that at which the sweep that is drawn by a team of horses is traveling. One serious objection incident to this class of mills is that the gearing soon becomes worn and injured and unfit for use because of the neglect of parties operating the mill to keep the gearing properly lubricated.

The present invention contemplates among other improvements so constructing the base of the mill that the driving-gear shall be located within a receptacle for oil, thereby insuring a constant and thorough lubrication of the gearing and wearing parts.

The invention consists also in other features of improvement to be hereinafter described, illustrated in the accompanying drawings, and particularly pointed out in the claims at the end of this specification.

Figure 1 is a view in central vertical section through a mill embodying my invention. Fig. 2 is a plan view with the hopper removed. Fig. 3 is a plan View of the base-mill with the outer cylinder and conveyer-pan removed. Fig. 4 is a detail plan view of the conveyerpan and conveyer therein.

A designates the base of the mill, that is formed-,preferably, as a casting mounted upon legs a, conveniently bolted thereto. The base A is formed with an upwardly-extending rim (1., and, as shown, is formed also with posts A that rise from the surface of the base and form journals for the gear-wheels B, that are arranged in convenient number, three of such gear-wheels being shown in the drawings. I have shown the baseAas provided with aseries of openings A, through one, at least, of which the ground feed will be discharged, and when ceptaole for lubricating-oil.

such openingsare employed the base will be formed with upwardly-extending flanges on around such openings A. With the gearwheels B mesh the teeth of an annular driving-rack O, that has formed therewith or suitably connected thereto the extensions O, 0 and C to which will be bolted the usual stayrod and A-frame of the sweep to which the team of horses will be hitched. The annular rack-bar 0 sets within the flanged base A,

and hence it will be seen that the several gears above the surface of the base A, and as well also the raclcbar C, may be effectively lubricated, as the base A forms a pan or re- The annular rack-bar O is provided with a laterally-extending flange that may rest upon the outer vertical flange a of the post, this flange thus serving to sustain the rack as it is revolved, or the lower edge of the annular rack may rest upon an annular rib rising from the base. Preferably an annular guide-flange cis formed upon the under side of the laterally-extending part of the annular rack.

With the gear-wheels B also meshes a central gear-wheel D, that is mounted upon the lower end of a post L, being keyed thereto by suitable interlocking ribs or grooves.-

Preferably, although not essentially, the post? L is so constructed that it may be moved in;

vertical direction independently of the gearwheel D, although, if desired, thegear-wheel may be raised with the post. The upper end of the post L sets within an opening formed in the hub J of the cone H, the upper part of the post L and the hub J being keyed together by interlocking ribs and grooves and the post L is shown as provided also with annular ribs Z adjacent its top and bottom. From the top of the post L extends the adjusting-rod N, the lower end of which is screw-threaded to engage a correspondinglythreaded hole in the top of the post L. The upper end of the rod N is furnished with a crank-handle or, if preferred, with a handwheel in order that the rod may be conveniently turned. A shoulder 17. on therod N bears against the upper surface of the hub of the cob-breaker, this cob-breaker having arms K extendingly outwardly therefrom. The hub 70 of the cob-breaker is connected to the central post j of the cone H, so as to revolve therewith, the upper end of the conepostj being preferably of square or like polygonal shape to engage a correspondinglyshaped recess in the base of the hub 70. The lower end of the hub rests upon the upper face of the hub i of the outer shell I, this hub '1; encircling the lower circular part of the cone-postj, soas to permit the cone-post to revolve within the hub t'. The hub 'i is connected with the outer shell I by the usual arms 1', having downwardly-extending teeth 2' that cooperate with correspondingly upwardly extending teeth h, that rise from the top of the cone [-1. The outer shell I has its lower part G preferably formed separate therefrom and bolted thereto, as at g, and this lower part G of the shell I, and by preference also the part of the shell I immediately above it, will be formed with the usual teeth that constitute the outer grinding ring or bur of the mill. So, also, the lower part of the cone H is preferably formed separate from and bolted to the upperpart of the cone, as at 77. and the lower part of the cone has its periphery formed with the usual teeth that comprise the inner grinding-ring of the mill. The outer shell of the mill rests upon and is bolted, as at g to 'an annular conveyer-pan M, the outer edge of the pan and the base of the shell being preferably formed with annular flanges to admit the connecting-bolts. The conveyer-pan M rests upon and is connected to the posts or journalsA that rise from the base A, preferably by means of through-bolts a, that pass through the bottom of the pan M and through the postsor journals A The bottom of the conveyerpan M is formed with one or more dischargeopenings m above the openings A in the base A, and within the conveyer-pan M is mounted the annular conveyer Q, that consists, preferably, of a central web having laterallyprojecting wings q in suitable number. The conveyor M is driven frome the cone H by the engagement with the wings of suitable lugs or arms 77. that project from the lower edge of the cone.

From the foregoing construction it will be seen that the outer shell of the mill is rigidly supported from the base through the medium of the conveyor-pan M and the inner revolu ble cone is supported through the medium of the post L, the adjusting-rod N, the cobbreaker hub 70, and the outer shell. IVhen revolution is imparted to the annular rack O, corresponding revolution will be imparted, through the gears B and D and the post L, to the cone H, and the speed of revolution of the cone will be determined by the size and arrangement of the gearing. To the upper edge of the outer shell will be connected a hopper R, into which the ears of corn or like material to be ground will be placed, and this material will pass downward between the in ner and the outer grinding rings or burs and thence into the conveyor-pan M, from which it will be discharged by the traveling conveyer Q in manner well understood by those familiar with this class of mills. When it is desired to raise or lower the cone in order to effect a finer or coarser grinding of the grain, this can be readily accomplished by turning the adj usting-rod N.

My invention not only affords an effective means for a thorough lubrication of the gearing of the mill, but by arranging the gearing beneath the grinding burs or rings the draft and Weight are disposed at such a low point as to most effectively distribute the strains in driving the mill and avoid danger of its tipping. The construction and arrangement of the conveyer-pan also serve for an effective discharge of the grain as it is ground.

It is manifest that the precise details of construction above set out may be varied by the skilled mechanic without departure from the spirit of the invention.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is

1. In agrinding-mill the combination with a stationary outer grinding-ring and a revo luble inner grinding-ring, of a base provided with a raised annular flange at its outer edge, a revoluble annular rack having teeth upon its inner face and arranged within and concentric with said raised outer base-flange,

means for attaching a sweep to said annular rack and gear-wheels journaled within and engaging said annular rack and connected with the revoluble grinding-ring.

2. In a grinding-mill, the combination with a stationary outer grinding-ring and a revoluble inner grinding-ring, of a base provided with a raised flange at its outer edge, a revoluble annular rack having teeth upon its inner face and arranged within said vertical base-flange and provided with a lateral flange extending over the top of said base-flange and covering the space between said flange and said rack, means for attaching a sweep to said annular rack and gear-wheels journaled within and engaging said annular rack and con nected with the revoluble grinding-ring.

In a grinding-mill, the combination with stationary and revoluble grinding-rings, of a base having formed integral therewith a raised outer flange and upwardly-projecting journals and formed also with a feed-discharge opening having a raised vertical flange surrounding the same, gear-wheels mounted upon said journals, a central post connected with the revoluble grinding-ring and having a gear-wheel that engages the gear-wheels upon said journals, and a revoluble annular rack located within the outer flange of the base and engaging the gear-wheels.

4. In a grinding-mill, the combination with a stationary outer shell and a revoluble inner cone each provided with a grinding ring or bur, of a base provided with a raised flange at its outer edge and with a discharge-opening having a raised flange extending around it, a revoluble annular rack having teeth upon its inner face and arranged Within said outer base -fiange, gear-Wheels journaled within and engaging said rack and connected with an inner cone, a conveyer-pan extending beneath the grinding-rin gs, said conveyerpan being arranged intermediate the outer shell and the base and being bolted to said parts and having a discharge-opening arranged opposite the discharge-opening of the base and a conveyer Within said conveyerpan.

5. In a grinding-mill, the combination with an outer stationary shell and an inner revoluble cone each provided with a grinding ring or bur, of an annular conveyer-pan located below said shell and cone and having a discharge-opening in its bottom, a base provided with a raised flange at its outer edge and proits inner face, a series of gear-Wheels jour-' naled upon studs rising from said base, a central gear-wheel meshing with said gear-wheels on said base and a post connected at its lower end to said central gear-Wheel and connected at its upper end to the inner revoluble cone.

WILLIAM F. DAVIS.

Witnesses:

GEO. P. FISHER, J r., ALBERTA ADAMICK. 

